------------[ cut here ]------------
!RB_EMPTY_ROOT(&prime_fpriv->dmabufs)
WARNING: drivers/gpu/drm/drm_prime.c:224 at drm_prime_destroy_file_private+0x4b/0x60, CPU#0: syz.0.11111/2214
Modules linked in:
CPU: 0 UID: 0 PID: 2214 Comm: syz.0.11111 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:drm_prime_destroy_file_private+0x4b/0x60
Code: 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 2d ca c6 fc 48 83 3b 00 75 0c e8 82 8c 5b fc 5b e9 4c 83 41 06 cc e8 76 8c 5b fc 90 <0f> 0b 90 5b e9 3c 83 41 06 cc 66 66 2e 0f 1f 84 00 00 00 00 00 90
RSP: 0018:ffffc90007657c40 EFLAGS: 00010293
RAX: ffffffff856a355a RBX: ffff8881787aa3b0 RCX: ffff888111d08000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8881787aa328
RBP: ffff8881787aa278 R08: ffffc90007657bc7 R09: 1ffff92000ecaf78
R10: dffffc0000000000 R11: fffff52000ecaf79 R12: dffffc0000000000
R13: dead000000000100 R14: 0000000000000000 R15: ffff8881787aa288
FS:  000055558892f500(0000) GS:ffff88818dc8d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000140 CR3: 0000000120c4c000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 drm_file_free+0x7f1/0xa00
 drm_release+0x2de/0x3f0
 __fput+0x44f/0xa60
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0xf3/0x4d0
 do_syscall_64+0x33e/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f96a7b9cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd2587a2e8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f96a7e17da0 RCX: 00007f96a7b9cdd9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f96a7e17da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f96a7e17cb0 R11: 0000000000000246 R12: 00000000000f1b4e
R13: 00007f96a7e1609c R14: 00000000000f1915 R15: 00007f96a7e16090
 </TASK>
